【題目】The Smiths were having dinner________the earth began to shake.

A. while B. when

C. as soon as D. Since

【答案】B

【解析】

句意：史密斯一家正在吃晚飯，這時(shí)大地開始搖晃起來。A. while正當(dāng)……的時(shí)候；B. when此時(shí)；C. as soon as一……就；D. Since自從。when有“正在這個(gè)時(shí)候”的意思，表示當(dāng)某一個(gè)動(dòng)作正在發(fā)生時(shí)，突然發(fā)生了另一件事，故答案B符合題意。

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